<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll">
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model="todoname"
      @keyup.enter="addFn"
    />
  </header>
</template>

<script>
export default {
  props: ['arr'],
  data(){
    return {
      todoname: ""
    }
  },
  computed: {
    isAll: {
      set(val){
        this.arr.forEach(obj => obj.isDone = val)
      },
      get(){
        if (this.arr.length == 0) return false;
        return this.arr.every(obj => obj.isDone === true)
      }
    }
  },
  methods: {
    addFn(){ // 回车时添加新任务
      this.$emit("getname", this.todoname);
      this.todoname = "";
    }
  }
}
</script>